Aluminum Ductwork | McMaster-Carr

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	Shape Shape


Straight	90° Elbow

Adjustable- Angle Elbow	Cap

Tee

	Connection Type Connection Type


Press Fit	Quick- Disconnect Clamp

	ID ID

	OD OD

	Component Component

	Gauge Gauge

	End Construction End Construction

Rolled

Crimped

Plain

	Gender Gender

Male

Female

	Duct Construction Duct Construction

Closed

Open

	Blade Material Blade Material

Steel

Aluminum

	Flange Thickness Flange Thickness

1/8"

9/64"

3/16"

	Number of Mounting Holes Number of Mounting Holes

	Mounting Hole Diameter Mounting Hole Diameter

9/32"

3/8"

7/16"

	Flange Mount Type Flange Mount Type

Screw On

	For Duct Shape For Duct Shape

Round

	Overall Depth Overall Depth

1 1/4"

1 1/2"

	Length Length

2 ft.

5 ft.

	Flange Height Flange Height

1 1/4"

1 1/2"

	Airflow Damper Type Airflow Damper Type

Standard

	Vent Type Vent Type

Exhaust

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145 Products

About Duct Connections

Join duct and fittings with quick-release clamps for faster disassembly and cleanout than other duct systems.

Aluminum is lightweight and has good corrosion resistance.

For technical drawings and 3-D models, click on a part number.

Blast Gates

Blast gates stop airflow when closed.

			Aluminum
Trade Size	ID	End Construction	Blade Material		Each
4	3 15/16"	Rolled	Galvanized Steel	0000000	000000
5	4 15/16"	Rolled	Galvanized Steel	0000000	00000
6	5 15/16"	Rolled	Galvanized Steel	0000000	00000
7	7"	Rolled	Galvanized Steel	0000000	00000
8	7 15/16"	Rolled	Galvanized Steel	00000000	00000
9	8 15/16"	Rolled	Galvanized Steel	00000000	00000
10	9 15/16"	Rolled	Galvanized Steel	00000000	000000
12	11 7/8"	Rolled	Galvanized Steel	00000000	000000
14	14"	Rolled	Galvanized Steel	00000000	000000
16	15 15/16"	Rolled	Galvanized Steel	00000000	000000

Standard Duct and Fittings

No need for clamps or connectors—duct and fittings press-fit together. Male ends are crimped or tapered, making them slightly smaller than a female end for simple assembly.

Aluminum is more lightweight than steel and stainless steel and has good corrosion resistance.

For technical drawings and 3-D models, click on a part number.

Duct

Open Duct

Open duct can be cut with snips prior to installation. The seam snaps together without tools.

					Aluminum
Trade Size	Female ID	Male OD	Gauge	End Construction		2 ft.	5 ft.
Open Duct
3	3"	2 7/8"	26	Crimped	000000	00000	000000
4	4"	3 7/8"	26	Crimped	000000	0000	00000
5	5"	4 7/8"	26	Crimped	000000	00000	00000
6	6"	5 7/8"	26	Crimped	00000000	00000	00000
7	7"	6 7/8"	26	Crimped	000000	00000	00000
8	8"	7 7/8"	26	Crimped	000000	00000	00000
9	9"	8 7/8"	26	Crimped	000000	00000	00000
10	10"	9 7/8"	26	Crimped	000000	00000	00000
12	12"	11 7/8"	26	Crimped	000000	00000	000000

Adjustable-Angle Elbow Connectors, 90° Elbow to Straight

Adjustable-angle elbow connectors can be used at an angle or straight.

					Aluminum
Trade Size	Female ID	Male OD	Gauge	End Construction		Each
3	3"	2 7/8"	26	Crimped	0000000	00000
4	4"	3 7/8"	26	Crimped	0000000	0000
5	5"	4 7/8"	26	Crimped	0000000	0000
6	6"	5 7/8"	26	Crimped	0000000	00000
7	7"	6 7/8"	26	Crimped	0000000	00000
8	8"	7 7/8"	26	Crimped	0000000	00000
9	9"	8 7/8"	26	Crimped	00000000	00000
10	10"	9 7/8"	26	Crimped	0000000	00000
12	12"	11 7/8"	26	Crimped	0000000	00000

Tee Connectors

Female × Female × Male

Tee connectors join or split runs of duct.

					Aluminum
Trade Size	Female ID	Male OD	Gauge	End Construction		Each
Female × Female × Male
3	3"	2 7/8"	26	Crimped	0000000	000000
4	4"	3 7/8"	26	Crimped	0000000	00000
5	5"	4 7/8"	26	Crimped	0000000	00000
6	6"	5 7/8"	26	Crimped	0000000	00000
7	7"	6 7/8"	26	Crimped	0000000	00000
8	8"	7 7/8"	26	Crimped	0000000	00000
9	9"	8 7/8"	26	Crimped	0000000	000000
10	10"	9 7/8"	26	Crimped	0000000	000000
12	12"	11 7/8"	26	Crimped	0000000	000000
14	14"	13 7/8"	26	Crimped	0000000	000000
16	16"	15 7/8"	26	Crimped	0000000	000000
18	18"	17 7/8"	26	Crimped	0000000	000000
20	20"	19 7/8"	26	Crimped	0000000	000000

Straight Reducers, Female × Male

Reducers connect duct with different diameters.

Trade Size					Aluminum
(A)	(B)	Female ID (A)	Male OD (B)	End Construction	Gauge		Each
4	3	4"	2 7/8"	Crimped	26	0000000	000000
5	4	5"	3 7/8"	Crimped	24	0000000	00000
6	4	6"	3 7/8"	Crimped	24	0000000	00000
7	4	7"	3 7/8"	Crimped	24	0000000	00000
7	5	7"	4 7/8"	Crimped	24	0000000	00000
8	6	8"	5 7/8"	Crimped	24	0000000	00000
10	6	10"	5 7/8"	Crimped	24	0000000	00000
10	8	10"	7 7/8"	Crimped	24	0000000	00000
12	8	12"	7 7/8"	Crimped	24	0000000	00000
12	10	12"	9 7/8"	Crimped	24	0000000	00000

Straight Reducers, Male × Female

Reducers connect duct with different diameters.

Trade Size						Aluminum
(A)	(B)	Male OD (A)	Female ID (B)	Gauge	End Construction		Each
4	3	3 7/8"	3"	26	Crimped	0000000	000000
5	4	4 7/8"	4"	26	Crimped	0000000	00000
6	4	5 7/8"	4"	26	Crimped	0000000	00000
7	5	6 7/8"	5"	26	Crimped	0000000	00000
8	6	7 7/8"	6"	26	Crimped	0000000	00000
10	6	9 7/8"	6"	26	Crimped	0000000	00000
10	8	9 7/8"	8"	26	Crimped	0000000	00000
12	8	11 7/8"	8"	26	Crimped	0000000	00000
12	10	11 7/8"	10"	26	Crimped	0000000	00000

Tee Reducers

Female × Female × Male

Reducers connect duct with different diameters.

Trade Size			Female ID		Male OD			Aluminum
(A)	(B)	(C)	(A)	(B)	(C)	Gauge	End Construction		Each
Female × Female × Male
4	3	4	4"	3"	3 7/8"	26	Crimped	0000000	0000000
5	3	5	5"	3"	4 7/8"	26	Crimped	0000000	000000
6	3	6	6"	3"	5 7/8"	26	Crimped	0000000	000000
6	4	6	6"	4"	5 7/8"	26	Crimped	0000000	000000

Airflow Dampers, Female × Male

Airflow dampers control airflow through duct.

					Aluminum
Trade Size	Female ID	Male OD	Gauge	End Construction	Blade Material		Each
Standard
3	3"	2 7/8"	26	Crimped	Aluminum	0000000	000000
4	4"	3 7/8"	26	Crimped	Aluminum	0000000	00000
6	6"	5 7/8"	26	Crimped	Aluminum	0000000	00000
8	8"	7 7/8"	26	Crimped	Aluminum	0000000	00000

Vent Caps

Exhaust Vent

				Aluminum
Trade Size	Female ID	Includes	End Construction	Gauge		Each
Exhaust Vent
3	3"	Damper	Plain	24	0000000	000000
4	4"	Damper	Plain	24	0000000	00000
6	6"	Damper	Plain	24	0000000	00000
8	8"	Damper	Plain	24	0000000	00000

Duct Flanges

Bolt flanges to equipment to start a run of duct. They can also create secure connections between two duct ends by mounting a flange to each end and then joining the flanges.

Aluminum flanges have good corrosion resistance in wet environments, and weigh less than steel and stainless steel flanges.

For technical drawings and 3-D models, click on a part number.

Aluminum

			Flange		Mounting
Trade Size	Female ID	Overall Dp.	Ht.	Thick.	Fasteners Included	No. of Holes	Hole Dia.	Connection Type		Each
3	3 1/16"	1"	1"	9/64"	No	6	9/32"	Press Fit	0000000	000000
3.5	3 9/16"	1"	1"	9/64"	No	6	9/32"	Press Fit	0000000	00000
4	4 1/16"	1"	1"	9/64"	No	6	9/32"	Press Fit	0000000	00000
4.5	4 9/16"	1"	1"	9/64"	No	6	9/32"	Press Fit	0000000	00000
5	5 1/16"	1"	1"	9/64"	No	6	9/32"	Press Fit	0000000	00000
5.5	5 9/16"	1"	1"	9/64"	No	6	9/32"	Press Fit	0000000	00000
6	6 1/8"	1 1/4"	1 1/4"	1/8"	No	6	3/8"	Press Fit	0000000	00000
7	7 1/8"	1 1/4"	1 1/4"	1/8"	No	6	3/8"	Press Fit	0000000	00000
8	8 1/8"	1 1/4"	1 1/4"	1/8"	No	6	3/8"	Press Fit	0000000	00000
9	9 1/8"	1 1/4"	1 1/4"	1/8"	No	6	3/8"	Press Fit	0000000	00000
10	10 1/8"	1 1/4"	1 1/4"	1/8"	No	6	3/8"	Press Fit	0000000	00000
11	11 1/8"	1 1/4"	1 1/4"	1/8"	No	6	3/8"	Press Fit	0000000	00000
12	12 1/8"	1 1/2"	1 1/2"	1/8"	No	8	7/16"	Press Fit	0000000	00000
13	13 1/8"	1 1/2"	1 1/2"	1/8"	No	8	7/16"	Press Fit	0000000	00000
14	14 1/8"	1 1/2"	1 1/2"	1/8"	No	8	7/16"	Press Fit	0000000	00000
15	15 1/8"	1 1/2"	1 1/2"	1/8"	No	8	7/16"	Press Fit	0000000	00000
16	16 1/8"	1 1/2"	1 1/2"	3/16"	No	8	7/16"	Press Fit	0000000	00000
17	17 1/8"	1 1/2"	1 1/2"	3/16"	No	8	7/16"	Press Fit	0000000	00000
18	18 1/8"	1 1/2"	1 1/2"	3/16"	No	8	7/16"	Press Fit	0000000	00000
19	19 1/8"	1 1/2"	1 1/2"	3/16"	No	12	7/16"	Press Fit	0000000	00000
20	20 1/8"	1 1/2"	1 1/2"	3/16"	No	12	7/16"	Press Fit	0000000	00000
21	21 1/8"	1 1/2"	1 1/2"	3/16"	No	12	7/16"	Press Fit	0000000	00000
22	22 1/8"	1 1/2"	1 1/2"	3/16"	No	12	7/16"	Press Fit	0000000	00000
23	23 1/8"	1 1/2"	1 1/2"	3/16"	No	12	7/16"	Press Fit	0000000	00000
24	24 1/8"	1 1/2"	1 1/2"	3/16"	No	12	7/16"	Press Fit	0000000	00000
25	25 1/8"	2"	2"	3/16"	No	16	7/16"	Press Fit	0000000	000000
26	26 1/8"	2"	2"	3/16"	No	16	7/16"	Press Fit	0000000	000000
27	27 1/8"	2"	2"	3/16"	No	16	7/16"	Press Fit	0000000	000000
28	28 1/8"	2"	2"	3/16"	No	16	7/16"	Press Fit	0000000	000000
29	29 1/8"	2"	2"	3/16"	No	16	7/16"	Press Fit	0000000	000000
30	30 1/8"	2"	2"	3/16"	No	16	7/16"	Press Fit	0000000	000000
31	31 1/8"	2"	2"	3/16"	No	16	7/16"	Press Fit	0000000	000000
32	32 1/8"	2"	2"	3/16"	No	16	7/16"	Press Fit	0000000	000000
33	33 1/8"	2"	2"	3/16"	No	16	7/16"	Press Fit	0000000	000000
34	34 1/8"	2"	2"	3/16"	No	16	7/16"	Press Fit	0000000	000000
35	35 1/8"	2"	2"	3/16"	No	16	7/16"	Press Fit	0000000	000000
36	36 1/8"	2"	2"	3/16"	No	16	7/16"	Press Fit	0000000	000000
37	37 1/8"	2"	2"	3/16"	No	24	7/16"	Press Fit	0000000	000000
38	38 1/8"	2"	2"	3/16"	No	24	7/16"	Press Fit	0000000	000000
39	39 1/8"	2"	2"	3/16"	No	24	7/16"	Press Fit	0000000	000000
40	40 1/8"	2"	2"	3/16"	No	24	7/16"	Press Fit	0000000	000000
41	41 1/8"	2"	2"	3/16"	No	24	7/16"	Press Fit	0000000	000000
42	42 1/8"	2"	2"	3/16"	No	24	7/16"	Press Fit	0000000	000000
43	43 1/8"	2"	2"	3/16"	No	24	7/16"	Press Fit	0000000	000000
44	44 1/8"	2"	2"	3/16"	No	24	7/16"	Press Fit	0000000	000000
45	45 1/8"	2"	2"	3/16"	No	24	7/16"	Press Fit	0000000	000000
46	46 1/8"	2"	2"	3/16"	No	24	7/16"	Press Fit	0000000	000000
47	47 1/8"	2"	2"	3/16"	No	24	7/16"	Press Fit	0000000	000000
48	48 1/8"	2"	2"	3/16"	No	24	7/16"	Press Fit	0000000	000000
49	49 1/8"	2"	2"	3/16"	No	24	7/16"	Press Fit	0000000	000000
50	50 1/8"	2"	2"	3/16"	No	24	7/16"	Press Fit	0000000	000000
51	51 1/8"	2"	2"	3/16"	No	24	7/16"	Press Fit	0000000	000000
52	52 1/8"	2"	2"	3/16"	No	24	7/16"	Press Fit	0000000	000000
53	53 1/8"	2"	2"	3/16"	No	24	7/16"	Press Fit	0000000	000000
54	54 1/8"	2"	2"	3/16"	No	24	7/16"	Press Fit	0000000	000000
55	55 1/8"	2"	2"	3/16"	No	24	7/16"	Press Fit	0000000	000000
56	56 1/8"	2"	2"	3/16"	No	24	7/16"	Press Fit	0000000	000000
57	57 1/8"	2"	2"	3/16"	No	32	7/16"	Press Fit	0000000	000000
58	58 1/8"	2"	2"	3/16"	No	32	7/16"	Press Fit	0000000	000000
59	59 1/8"	2"	2"	3/16"	No	32	7/16"	Press Fit	0000000	000000
60	60 1/8"	2"	2"	3/16"	No	32	7/16"	Press Fit	0000000	000000
61	61 1/8"	2"	2"	3/16"	No	32	7/16"	Press Fit	0000000	000000
62	62 1/8"	2"	2"	3/16"	No	32	7/16"	Press Fit	0000000	000000
63	63 1/8"	2"	2"	3/16"	No	32	7/16"	Press Fit	0000000	000000
64	64 1/8"	2"	2"	3/16"	No	32	7/16"	Press Fit	0000000	000000
65	65 1/8"	2"	2"	3/16"	No	36	7/16"	Press Fit	0000000	000000
66	66 1/8"	2"	2"	3/16"	No	36	7/16"	Press Fit	0000000	000000
67	67 1/8"	2"	2"	3/16"	No	36	7/16"	Press Fit	0000000	000000
68	68 1/8"	2"	2"	3/16"	No	36	7/16"	Press Fit	0000000	000000
69	69 1/8"	2"	2"	3/16"	No	36	7/16"	Press Fit	0000000	000000
70	70 1/8"	2"	2"	3/16"	No	36	7/16"	Press Fit	0000000	000000
71	71 1/8"	2"	2"	3/16"	No	36	7/16"	Press Fit	0000000	000000
72	72 1/8"	2"	2"	3/16"	No	36	7/16"	Press Fit	0000000	000000

Terms and Conditions and Privacy Policy

About Duct Connections

Quick-Disconnect Duct and Fittings

Standard Duct and Fittings

Duct Flanges

Quick-Disconnect Duct and Fittings

Standard Duct and Fittings

Duct Flanges